1/* 2 * Cypress APA trackpad with I2C interface 3 * 4 * Author: Dudley Du <dudl@cypress.com> 5 * Further cleanup and restructuring by: 6 * Daniel Kurtz <djkurtz@chromium.org> 7 * Benson Leung <bleung@chromium.org> 8 * 9 * Copyright (C) 2011-2015 Cypress Semiconductor, Inc. 10 * Copyright (C) 2011-2012 Google, Inc. 11 * 12 * This file is subject to the terms and conditions of the GNU General Public 13 * License. See the file COPYING in the main directory of this archive for 14 * more details. 15 */ 16 17#include <linux/delay.h> 18#include <linux/i2c.h> 19#include <linux/input.h> 20#include <linux/input/mt.h> 21#include <linux/interrupt.h> 22#include <linux/module.h> 23#include <linux/mutex.h> 24#include <linux/regulator/consumer.h> 25#include <linux/slab.h> 26#include <linux/uaccess.h> 27#include <linux/pm_runtime.h> 28#include <linux/acpi.h> 29#include <linux/of.h> 30#include "cyapa.h" 31 32 33#define CYAPA_ADAPTER_FUNC_NONE 0 34#define CYAPA_ADAPTER_FUNC_I2C 1 35#define CYAPA_ADAPTER_FUNC_SMBUS 2 36#define CYAPA_ADAPTER_FUNC_BOTH 3 37 38#define CYAPA_FW_NAME "cyapa.bin" 39 40const char product_id[] = "CYTRA"; 41 42static int cyapa_reinitialize(struct cyapa *cyapa); 43 44bool cyapa_is_pip_bl_mode(struct cyapa *cyapa) 45{ 46 if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_BL) 47 return true; 48 49 if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_BL) 50 return true; 51 52 return false; 53} 54 55bool cyapa_is_pip_app_mode(struct cyapa *cyapa) 56{ 57 if (cyapa->gen == CYAPA_GEN6 && cyapa->state == CYAPA_STATE_GEN6_APP) 58 return true; 59 60 if (cyapa->gen == CYAPA_GEN5 && cyapa->state == CYAPA_STATE_GEN5_APP) 61 return true; 62 63 return false; 64} 65 66static bool cyapa_is_bootloader_mode(struct cyapa *cyapa) 67{ 68 if (cyapa_is_pip_bl_mode(cyapa)) 69 return true; 70 71 if (cyapa->gen == CYAPA_GEN3 && 72 cyapa->state >= CYAPA_STATE_BL_BUSY && 73 cyapa->state <= CYAPA_STATE_BL_ACTIVE) 74 return true; 75 76 return false; 77} 78 79static inline bool cyapa_is_operational_mode(struct cyapa *cyapa) 80{ 81 if (cyapa_is_pip_app_mode(cyapa)) 82 return true; 83 84 if (cyapa->gen == CYAPA_GEN3 && cyapa->state == CYAPA_STATE_OP) 85 return true; 86 87 return false; 88} 89 90/* Returns 0 on success, else negative errno on failure. */ 91static ssize_t cyapa_i2c_read(struct cyapa *cyapa, u8 reg, size_t len, 92 u8 *values) 93{ 94 struct i2c_client *client = cyapa->client; 95 struct i2c_msg msgs[] = { 96 { 97 .addr = client->addr, 98 .flags = 0, 99 .len = 1, 100 .buf = ®, 101 }, 102 { 103 .addr = client->addr, 104 .flags = I2C_M_RD, 105 .len = len, 106 .buf = values, 107 }, 108 }; 109 int ret; 110 111 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 112 113 if (ret != ARRAY_SIZE(msgs)) 114 return ret < 0 ? ret : -EIO; 115 116 return 0; 117} 118 119/** 120 * cyapa_i2c_write - Execute i2c block data write operation 121 * @cyapa: Handle to this driver 122 * @reg: Offset of the data to written in the register map 123 * @len: number of bytes to write 124 * @values: Data to be written 125 * 126 * Return negative errno code on error; return zero when success. 127 */ 128static int cyapa_i2c_write(struct cyapa *cyapa, u8 reg, 129 size_t len, const void *values) 130{ 131 struct i2c_client *client = cyapa->client; 132 char buf[32]; 133 int ret; 134 135 if (len > sizeof(buf) - 1) 136 return -ENOMEM; 137 138 buf[0] = reg; 139 memcpy(&buf[1], values, len); 140 141 ret = i2c_master_send(client, buf, len + 1); 142 if (ret != len + 1) 143 return ret < 0 ? ret : -EIO; 144 145 return 0; 146} 147 148static u8 cyapa_check_adapter_functionality(struct i2c_client *client) 149{ 150 u8 ret = CYAPA_ADAPTER_FUNC_NONE; 151 152 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 153 ret |= CYAPA_ADAPTER_FUNC_I2C; 154 if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | 155 I2C_FUNC_SMBUS_BLOCK_DATA | 156 I2C_FUNC_SMBUS_I2C_BLOCK)) 157 ret |= CYAPA_ADAPTER_FUNC_SMBUS; 158 return ret; 159} 160 161/* 162 * Query device for its current operating state. 163 */ 164static int cyapa_get_state(struct cyapa *cyapa) 165{ 166 u8 status[BL_STATUS_SIZE]; 167 u8 cmd[32]; 168 /* The i2c address of gen4 and gen5 trackpad device must be even. */ 169 bool even_addr = ((cyapa->client->addr & 0x0001) == 0); 170 bool smbus = false; 171 int retries = 2; 172 int error; 173 174 cyapa->state = CYAPA_STATE_NO_DEVICE; 175 176 /* 177 * Get trackpad status by reading 3 registers starting from 0. 178 * If the device is in the bootloader, this will be BL_HEAD. 179 * If the device is in operation mode, this will be the DATA regs. 180 * 181 */ 182 error = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE, 183 status); 184 185 /* 186 * On smbus systems in OP mode, the i2c_reg_read will fail with 187 * -ETIMEDOUT. In this case, try again using the smbus equivalent 188 * command. This should return a BL_HEAD indicating CYAPA_STATE_OP. 189 */ 190 if (cyapa->smbus && (error == -ETIMEDOUT || error == -ENXIO)) { 191 if (!even_addr) 192 error = cyapa_read_block(cyapa, 193 CYAPA_CMD_BL_STATUS, status); 194 smbus = true; 195 } 196 197 if (error != BL_STATUS_SIZE) 198 goto error; 199 200 /* 201 * Detect trackpad protocol based on characteristic registers and bits. 202 */ 203 do { 204 cyapa->status[REG_OP_STATUS] = status[REG_OP_STATUS]; 205 cyapa->status[REG_BL_STATUS] = status[REG_BL_STATUS]; 206 cyapa->status[REG_BL_ERROR] = status[REG_BL_ERROR]; 207 208 if (cyapa->gen == CYAPA_GEN_UNKNOWN || 209 cyapa->gen == CYAPA_GEN3) { 210 error = cyapa_gen3_ops.state_parse(cyapa, 211 status, BL_STATUS_SIZE); 212 if (!error) 213 goto out_detected; 214 } 215 if (cyapa->gen == CYAPA_GEN_UNKNOWN || 216 cyapa->gen == CYAPA_GEN6 || 217 cyapa->gen == CYAPA_GEN5) { 218 error = cyapa_pip_state_parse(cyapa, 219 status, BL_STATUS_SIZE); 220 if (!error) 221 goto out_detected; 222 } 223 /* For old Gen5 trackpads detecting. */ 224 if ((cyapa->gen == CYAPA_GEN_UNKNOWN || 225 cyapa->gen == CYAPA_GEN5) && 226 !smbus && even_addr) { 227 error = cyapa_gen5_ops.state_parse(cyapa, 228 status, BL_STATUS_SIZE); 229 if (!error) 230 goto out_detected; 231 } 232 233 /* 234 * Write 0x00 0x00 to trackpad device to force update its 235 * status, then redo the detection again. 236 */ 237 if (!smbus) { 238 cmd[0] = 0x00; 239 cmd[1] = 0x00; 240 error = cyapa_i2c_write(cyapa, 0, 2, cmd); 241 if (error) 242 goto error; 243 244 msleep(50); 245 246 error = cyapa_i2c_read(cyapa, BL_HEAD_OFFSET, 247 BL_STATUS_SIZE, status); 248 if (error) 249 goto error; 250 } 251 } while (--retries > 0 && !smbus); 252 253 goto error; 254 255out_detected: 256 if (cyapa->state <= CYAPA_STATE_BL_BUSY) 257 return -EAGAIN; 258 return 0; 259 260error: 261 return (error < 0) ? error : -EAGAIN; 262} 263 264/* 265 * Poll device for its status in a loop, waiting up to timeout for a response. 266 * 267 * When the device switches state, it usually takes ~300 ms. 268 * However, when running a new firmware image, the device must calibrate its 269 * sensors, which can take as long as 2 seconds. 270 * 271 * Note: The timeout has granularity of the polling rate, which is 100 ms. 272 * 273 * Returns: 274 * 0 when the device eventually responds with a valid non-busy state. 275 * -ETIMEDOUT if device never responds (too many -EAGAIN) 276 * -EAGAIN if bootload is busy, or unknown state. 277 * < 0 other errors 278 */ 279int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout) 280{ 281 int error; 282 int tries = timeout / 100; 283 284 do { 285 error = cyapa_get_state(cyapa); 286 if (!error && cyapa->state > CYAPA_STATE_BL_BUSY) 287 return 0; 288 289 msleep(100); 290 } while (tries--); 291 292 return (error == -EAGAIN || error == -ETIMEDOUT) ? -ETIMEDOUT : error; 293} 294 295/* 296 * Check if device is operational. 297 * 298 * An operational device is responding, has exited bootloader, and has 299 * firmware supported by this driver. 300 * 301 * Returns: 302 * -ENODEV no device 303 * -EBUSY no device or in bootloader 304 * -EIO failure while reading from device 305 * -ETIMEDOUT timeout failure for bus idle or bus no response 306 * -EAGAIN device is still in bootloader 307 * if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware 308 * -EINVAL device is in operational mode, but not supported by this driver 309 * 0 device is supported 310 */ 311static int cyapa_check_is_operational(struct cyapa *cyapa) 312{ 313 int error; 314 315 error = cyapa_poll_state(cyapa, 4000); 316 if (error) 317 return error; 318 319 switch (cyapa->gen) { 320 case CYAPA_GEN6: 321 cyapa->ops = &cyapa_gen6_ops; 322 break; 323 case CYAPA_GEN5: 324 cyapa->ops = &cyapa_gen5_ops; 325 break; 326 case CYAPA_GEN3: 327 cyapa->ops = &cyapa_gen3_ops; 328 break; 329 default: 330 return -ENODEV; 331 } 332 333 error = cyapa->ops->operational_check(cyapa); 334 if (!error && cyapa_is_operational_mode(cyapa)) 335 cyapa->operational = true; 336 else 337 cyapa->operational = false; 338 339 return error; 340} 341 342 343/* 344 * Returns 0 on device detected, negative errno on no device detected. 345 * And when the device is detected and operational, it will be reset to 346 * full power active mode automatically. 347 */ 348static int cyapa_detect(struct cyapa *cyapa) 349{ 350 struct device *dev = &cyapa->client->dev; 351 int error; 352 353 error = cyapa_check_is_operational(cyapa); 354 if (error) { 355 if (error != -ETIMEDOUT && error != -ENODEV && 356 cyapa_is_bootloader_mode(cyapa)) { 357 dev_warn(dev, "device detected but not operational\n"); 358 return 0; 359 } 360 361 dev_err(dev, "no device detected: %d\n", error); 362 return error; 363 } 364 365 return 0; 366} 367 368static int cyapa_open(struct input_dev *input) 369{ 370 struct cyapa *cyapa = input_get_drvdata(input); 371 struct i2c_client *client = cyapa->client; 372 struct device *dev = &client->dev; 373 int error; 374 375 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 376 if (error) 377 return error; 378 379 if (cyapa->operational) { 380 /* 381 * though failed to set active power mode, 382 * but still may be able to work in lower scan rate 383 * when in operational mode. 384 */ 385 error = cyapa->ops->set_power_mode(cyapa, 386 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE); 387 if (error) { 388 dev_warn(dev, "set active power failed: %d\n", error); 389 goto out; 390 } 391 } else { 392 error = cyapa_reinitialize(cyapa); 393 if (error || !cyapa->operational) { 394 error = error ? error : -EAGAIN; 395 goto out; 396 } 397 } 398 399 enable_irq(client->irq); 400 if (!pm_runtime_enabled(dev)) { 401 pm_runtime_set_active(dev); 402 pm_runtime_enable(dev); 403 } 404 405 pm_runtime_get_sync(dev); 406 pm_runtime_mark_last_busy(dev); 407 pm_runtime_put_sync_autosuspend(dev); 408out: 409 mutex_unlock(&cyapa->state_sync_lock); 410 return error; 411} 412 413static void cyapa_close(struct input_dev *input) 414{ 415 struct cyapa *cyapa = input_get_drvdata(input); 416 struct i2c_client *client = cyapa->client; 417 struct device *dev = &cyapa->client->dev; 418 419 mutex_lock(&cyapa->state_sync_lock); 420 421 disable_irq(client->irq); 422 if (pm_runtime_enabled(dev)) 423 pm_runtime_disable(dev); 424 pm_runtime_set_suspended(dev); 425 426 if (cyapa->operational) 427 cyapa->ops->set_power_mode(cyapa, 428 PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE); 429 430 mutex_unlock(&cyapa->state_sync_lock); 431} 432 433static int cyapa_create_input_dev(struct cyapa *cyapa) 434{ 435 struct device *dev = &cyapa->client->dev; 436 struct input_dev *input; 437 int error; 438 439 if (!cyapa->physical_size_x || !cyapa->physical_size_y) 440 return -EINVAL; 441 442 input = devm_input_allocate_device(dev); 443 if (!input) { 444 dev_err(dev, "failed to allocate memory for input device.\n"); 445 return -ENOMEM; 446 } 447 448 input->name = CYAPA_NAME; 449 input->phys = cyapa->phys; 450 input->id.bustype = BUS_I2C; 451 input->id.version = 1; 452 input->id.product = 0; /* Means any product in eventcomm. */ 453 input->dev.parent = &cyapa->client->dev; 454 455 input->open = cyapa_open; 456 input->close = cyapa_close; 457 458 input_set_drvdata(input, cyapa); 459 460 __set_bit(EV_ABS, input->evbit); 461 462 /* Finger position */ 463 input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0, 464 0); 465 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0, 466 0); 467 input_set_abs_params(input, ABS_MT_PRESSURE, 0, cyapa->max_z, 0, 0); 468 if (cyapa->gen > CYAPA_GEN3) { 469 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); 470 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0); 471 /* 472 * Orientation is the angle between the vertical axis and 473 * the major axis of the contact ellipse. 474 * The range is -127 to 127. 475 * the positive direction is clockwise form the vertical axis. 476 * If the ellipse of contact degenerates into a circle, 477 * orientation is reported as 0. 478 * 479 * Also, for Gen5 trackpad the accurate of this orientation 480 * value is value + (-30 ~ 30). 481 */ 482 input_set_abs_params(input, ABS_MT_ORIENTATION, 483 -127, 127, 0, 0); 484 } 485 if (cyapa->gen >= CYAPA_GEN5) { 486 input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); 487 input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 255, 0, 0); 488 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0); 489 } 490 491 input_abs_set_res(input, ABS_MT_POSITION_X, 492 cyapa->max_abs_x / cyapa->physical_size_x); 493 input_abs_set_res(input, ABS_MT_POSITION_Y, 494 cyapa->max_abs_y / cyapa->physical_size_y); 495 496 if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK) 497 __set_bit(BTN_LEFT, input->keybit); 498 if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK) 499 __set_bit(BTN_MIDDLE, input->keybit); 500 if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK) 501 __set_bit(BTN_RIGHT, input->keybit); 502 503 if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK) 504 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 505 506 /* Handle pointer emulation and unused slots in core */ 507 error = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS, 508 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); 509 if (error) { 510 dev_err(dev, "failed to initialize MT slots: %d\n", error); 511 return error; 512 } 513 514 /* Register the device in input subsystem */ 515 error = input_register_device(input); 516 if (error) { 517 dev_err(dev, "failed to register input device: %d\n", error); 518 return error; 519 } 520 521 cyapa->input = input; 522 return 0; 523} 524 525static void cyapa_enable_irq_for_cmd(struct cyapa *cyapa) 526{ 527 struct input_dev *input = cyapa->input; 528 529 if (!input || !input_device_enabled(input)) { 530 /* 531 * When input is NULL, TP must be in deep sleep mode. 532 * In this mode, later non-power I2C command will always failed 533 * if not bring it out of deep sleep mode firstly, 534 * so must command TP to active mode here. 535 */ 536 if (!input || cyapa->operational) 537 cyapa->ops->set_power_mode(cyapa, 538 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE); 539 /* Gen3 always using polling mode for command. */ 540 if (cyapa->gen >= CYAPA_GEN5) 541 enable_irq(cyapa->client->irq); 542 } 543} 544 545static void cyapa_disable_irq_for_cmd(struct cyapa *cyapa) 546{ 547 struct input_dev *input = cyapa->input; 548 549 if (!input || !input_device_enabled(input)) { 550 if (cyapa->gen >= CYAPA_GEN5) 551 disable_irq(cyapa->client->irq); 552 if (!input || cyapa->operational) 553 cyapa->ops->set_power_mode(cyapa, 554 PWR_MODE_OFF, 0, CYAPA_PM_ACTIVE); 555 } 556} 557 558/* 559 * cyapa_sleep_time_to_pwr_cmd and cyapa_pwr_cmd_to_sleep_time 560 * 561 * These are helper functions that convert to and from integer idle 562 * times and register settings to write to the PowerMode register. 563 * The trackpad supports between 20ms to 1000ms scan intervals. 564 * The time will be increased in increments of 10ms from 20ms to 100ms. 565 * From 100ms to 1000ms, time will be increased in increments of 20ms. 566 * 567 * When Idle_Time < 100, the format to convert Idle_Time to Idle_Command is: 568 * Idle_Command = Idle Time / 10; 569 * When Idle_Time >= 100, the format to convert Idle_Time to Idle_Command is: 570 * Idle_Command = Idle Time / 20 + 5; 571 */ 572u8 cyapa_sleep_time_to_pwr_cmd(u16 sleep_time) 573{ 574 u16 encoded_time; 575 576 sleep_time = clamp_val(sleep_time, 20, 1000); 577 encoded_time = sleep_time < 100 ? sleep_time / 10 : sleep_time / 20 + 5; 578 return (encoded_time << 2) & PWR_MODE_MASK; 579} 580 581u16 cyapa_pwr_cmd_to_sleep_time(u8 pwr_mode) 582{ 583 u8 encoded_time = pwr_mode >> 2; 584 585 return (encoded_time < 10) ? encoded_time * 10 586 : (encoded_time - 5) * 20; 587} 588 589/* 0 on driver initialize and detected successfully, negative on failure. */ 590static int cyapa_initialize(struct cyapa *cyapa) 591{ 592 int error = 0; 593 594 cyapa->state = CYAPA_STATE_NO_DEVICE; 595 cyapa->gen = CYAPA_GEN_UNKNOWN; 596 mutex_init(&cyapa->state_sync_lock); 597 598 /* 599 * Set to hard code default, they will be updated with trackpad set 600 * default values after probe and initialized. 601 */ 602 cyapa->suspend_power_mode = PWR_MODE_SLEEP; 603 cyapa->suspend_sleep_time = 604 cyapa_pwr_cmd_to_sleep_time(cyapa->suspend_power_mode); 605 606 /* ops.initialize() is aimed to prepare for module communications. */ 607 error = cyapa_gen3_ops.initialize(cyapa); 608 if (!error) 609 error = cyapa_gen5_ops.initialize(cyapa); 610 if (!error) 611 error = cyapa_gen6_ops.initialize(cyapa); 612 if (error) 613 return error; 614 615 error = cyapa_detect(cyapa); 616 if (error) 617 return error; 618 619 /* Power down the device until we need it. */ 620 if (cyapa->operational) 621 cyapa->ops->set_power_mode(cyapa, 622 PWR_MODE_OFF, 0, CYAPA_PM_ACTIVE); 623 624 return 0; 625} 626 627static int cyapa_reinitialize(struct cyapa *cyapa) 628{ 629 struct device *dev = &cyapa->client->dev; 630 struct input_dev *input = cyapa->input; 631 int error; 632 633 if (pm_runtime_enabled(dev)) 634 pm_runtime_disable(dev); 635 636 /* Avoid command failures when TP was in OFF state. */ 637 if (cyapa->operational) 638 cyapa->ops->set_power_mode(cyapa, 639 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_ACTIVE); 640 641 error = cyapa_detect(cyapa); 642 if (error) 643 goto out; 644 645 if (!input && cyapa->operational) { 646 error = cyapa_create_input_dev(cyapa); 647 if (error) { 648 dev_err(dev, "create input_dev instance failed: %d\n", 649 error); 650 goto out; 651 } 652 } 653 654out: 655 if (!input || !input_device_enabled(input)) { 656 /* Reset to power OFF state to save power when no user open. */ 657 if (cyapa->operational) 658 cyapa->ops->set_power_mode(cyapa, 659 PWR_MODE_OFF, 0, CYAPA_PM_DEACTIVE); 660 } else if (!error && cyapa->operational) { 661 /* 662 * Make sure only enable runtime PM when device is 663 * in operational mode and input->users > 0. 664 */ 665 pm_runtime_set_active(dev); 666 pm_runtime_enable(dev); 667 668 pm_runtime_get_sync(dev); 669 pm_runtime_mark_last_busy(dev); 670 pm_runtime_put_sync_autosuspend(dev); 671 } 672 673 return error; 674} 675 676static irqreturn_t cyapa_irq(int irq, void *dev_id) 677{ 678 struct cyapa *cyapa = dev_id; 679 struct device *dev = &cyapa->client->dev; 680 int error; 681 682 if (device_may_wakeup(dev)) 683 pm_wakeup_event(dev, 0); 684 685 /* Interrupt event can be caused by host command to trackpad device. */ 686 if (cyapa->ops->irq_cmd_handler(cyapa)) { 687 /* 688 * Interrupt event maybe from trackpad device input reporting. 689 */ 690 if (!cyapa->input) { 691 /* 692 * Still in probing or in firmware image 693 * updating or reading. 694 */ 695 cyapa->ops->sort_empty_output_data(cyapa, 696 NULL, NULL, NULL); 697 goto out; 698 } 699 700 if (cyapa->operational) { 701 error = cyapa->ops->irq_handler(cyapa); 702 703 /* 704 * Apply runtime power management to touch report event 705 * except the events caused by the command responses. 706 * Note: 707 * It will introduce about 20~40 ms additional delay 708 * time in receiving for first valid touch report data. 709 * The time is used to execute device runtime resume 710 * process. 711 */ 712 pm_runtime_get_sync(dev); 713 pm_runtime_mark_last_busy(dev); 714 pm_runtime_put_sync_autosuspend(dev); 715 } 716 717 if (!cyapa->operational || error) { 718 if (!mutex_trylock(&cyapa->state_sync_lock)) { 719 cyapa->ops->sort_empty_output_data(cyapa, 720 NULL, NULL, NULL); 721 goto out; 722 } 723 cyapa_reinitialize(cyapa); 724 mutex_unlock(&cyapa->state_sync_lock); 725 } 726 } 727 728out: 729 return IRQ_HANDLED; 730} 731 732/* 733 ************************************************************** 734 * sysfs interface 735 ************************************************************** 736*/ 737#ifdef CONFIG_PM_SLEEP 738static ssize_t cyapa_show_suspend_scanrate(struct device *dev, 739 struct device_attribute *attr, 740 char *buf) 741{ 742 struct cyapa *cyapa = dev_get_drvdata(dev); 743 u8 pwr_cmd; 744 u16 sleep_time; 745 int len; 746 int error; 747 748 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 749 if (error) 750 return error; 751 752 pwr_cmd = cyapa->suspend_power_mode; 753 sleep_time = cyapa->suspend_sleep_time; 754 755 mutex_unlock(&cyapa->state_sync_lock); 756 757 switch (pwr_cmd) { 758 case PWR_MODE_BTN_ONLY: 759 len = sysfs_emit(buf, "%s\n", BTN_ONLY_MODE_NAME); 760 break; 761 762 case PWR_MODE_OFF: 763 len = sysfs_emit(buf, "%s\n", OFF_MODE_NAME); 764 break; 765 766 default: 767 len = sysfs_emit(buf, "%u\n", 768 cyapa->gen == CYAPA_GEN3 ? 769 cyapa_pwr_cmd_to_sleep_time(pwr_cmd) : 770 sleep_time); 771 break; 772 } 773 774 return len; 775} 776 777static ssize_t cyapa_update_suspend_scanrate(struct device *dev, 778 struct device_attribute *attr, 779 const char *buf, size_t count) 780{ 781 struct cyapa *cyapa = dev_get_drvdata(dev); 782 u16 sleep_time; 783 int error; 784 785 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 786 if (error) 787 return error; 788 789 if (sysfs_streq(buf, BTN_ONLY_MODE_NAME)) { 790 cyapa->suspend_power_mode = PWR_MODE_BTN_ONLY; 791 } else if (sysfs_streq(buf, OFF_MODE_NAME)) { 792 cyapa->suspend_power_mode = PWR_MODE_OFF; 793 } else if (!kstrtou16(buf, 10, &sleep_time)) { 794 cyapa->suspend_sleep_time = min_t(u16, sleep_time, 1000); 795 cyapa->suspend_power_mode = 796 cyapa_sleep_time_to_pwr_cmd(cyapa->suspend_sleep_time); 797 } else { 798 count = -EINVAL; 799 } 800 801 mutex_unlock(&cyapa->state_sync_lock); 802 803 return count; 804} 805 806static DEVICE_ATTR(suspend_scanrate_ms, S_IRUGO|S_IWUSR, 807 cyapa_show_suspend_scanrate, 808 cyapa_update_suspend_scanrate); 809 810static struct attribute *cyapa_power_wakeup_entries[] = { 811 &dev_attr_suspend_scanrate_ms.attr, 812 NULL, 813}; 814 815static const struct attribute_group cyapa_power_wakeup_group = { 816 .name = power_group_name, 817 .attrs = cyapa_power_wakeup_entries, 818}; 819 820static void cyapa_remove_power_wakeup_group(void *data) 821{ 822 struct cyapa *cyapa = data; 823 824 sysfs_unmerge_group(&cyapa->client->dev.kobj, 825 &cyapa_power_wakeup_group); 826} 827 828static int cyapa_prepare_wakeup_controls(struct cyapa *cyapa) 829{ 830 struct i2c_client *client = cyapa->client; 831 struct device *dev = &client->dev; 832 int error; 833 834 if (device_can_wakeup(dev)) { 835 error = sysfs_merge_group(&dev->kobj, 836 &cyapa_power_wakeup_group); 837 if (error) { 838 dev_err(dev, "failed to add power wakeup group: %d\n", 839 error); 840 return error; 841 } 842 843 error = devm_add_action_or_reset(dev, 844 cyapa_remove_power_wakeup_group, cyapa); 845 if (error) { 846 dev_err(dev, "failed to add power cleanup action: %d\n", 847 error); 848 return error; 849 } 850 } 851 852 return 0; 853} 854#else 855static inline int cyapa_prepare_wakeup_controls(struct cyapa *cyapa) 856{ 857 return 0; 858} 859#endif /* CONFIG_PM_SLEEP */ 860 861#ifdef CONFIG_PM 862static ssize_t cyapa_show_rt_suspend_scanrate(struct device *dev, 863 struct device_attribute *attr, 864 char *buf) 865{ 866 struct cyapa *cyapa = dev_get_drvdata(dev); 867 u8 pwr_cmd; 868 u16 sleep_time; 869 int error; 870 871 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 872 if (error) 873 return error; 874 875 pwr_cmd = cyapa->runtime_suspend_power_mode; 876 sleep_time = cyapa->runtime_suspend_sleep_time; 877 878 mutex_unlock(&cyapa->state_sync_lock); 879 880 return sysfs_emit(buf, "%u\n", 881 cyapa->gen == CYAPA_GEN3 ? 882 cyapa_pwr_cmd_to_sleep_time(pwr_cmd) : 883 sleep_time); 884} 885 886static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev, 887 struct device_attribute *attr, 888 const char *buf, size_t count) 889{ 890 struct cyapa *cyapa = dev_get_drvdata(dev); 891 u16 time; 892 int error; 893 894 if (buf == NULL || count == 0 || kstrtou16(buf, 10, &time)) { 895 dev_err(dev, "invalid runtime suspend scanrate ms parameter\n"); 896 return -EINVAL; 897 } 898 899 /* 900 * When the suspend scanrate is changed, pm_runtime_get to resume 901 * a potentially suspended device, update to the new pwr_cmd 902 * and then pm_runtime_put to suspend into the new power mode. 903 */ 904 pm_runtime_get_sync(dev); 905 906 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 907 if (error) 908 return error; 909 910 cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000); 911 cyapa->runtime_suspend_power_mode = 912 cyapa_sleep_time_to_pwr_cmd(cyapa->runtime_suspend_sleep_time); 913 914 mutex_unlock(&cyapa->state_sync_lock); 915 916 pm_runtime_put_sync_autosuspend(dev); 917 918 return count; 919} 920 921static DEVICE_ATTR(runtime_suspend_scanrate_ms, S_IRUGO|S_IWUSR, 922 cyapa_show_rt_suspend_scanrate, 923 cyapa_update_rt_suspend_scanrate); 924 925static struct attribute *cyapa_power_runtime_entries[] = { 926 &dev_attr_runtime_suspend_scanrate_ms.attr, 927 NULL, 928}; 929 930static const struct attribute_group cyapa_power_runtime_group = { 931 .name = power_group_name, 932 .attrs = cyapa_power_runtime_entries, 933}; 934 935static void cyapa_remove_power_runtime_group(void *data) 936{ 937 struct cyapa *cyapa = data; 938 939 sysfs_unmerge_group(&cyapa->client->dev.kobj, 940 &cyapa_power_runtime_group); 941} 942 943static int cyapa_start_runtime(struct cyapa *cyapa) 944{ 945 struct device *dev = &cyapa->client->dev; 946 int error; 947 948 cyapa->runtime_suspend_power_mode = PWR_MODE_IDLE; 949 cyapa->runtime_suspend_sleep_time = 950 cyapa_pwr_cmd_to_sleep_time(cyapa->runtime_suspend_power_mode); 951 952 error = sysfs_merge_group(&dev->kobj, &cyapa_power_runtime_group); 953 if (error) { 954 dev_err(dev, 955 "failed to create power runtime group: %d\n", error); 956 return error; 957 } 958 959 error = devm_add_action_or_reset(dev, cyapa_remove_power_runtime_group, 960 cyapa); 961 if (error) { 962 dev_err(dev, 963 "failed to add power runtime cleanup action: %d\n", 964 error); 965 return error; 966 } 967 968 /* runtime is enabled until device is operational and opened. */ 969 pm_runtime_set_suspended(dev); 970 pm_runtime_use_autosuspend(dev); 971 pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY); 972 973 return 0; 974} 975#else 976static inline int cyapa_start_runtime(struct cyapa *cyapa) 977{ 978 return 0; 979} 980#endif /* CONFIG_PM */ 981 982static ssize_t cyapa_show_fm_ver(struct device *dev, 983 struct device_attribute *attr, char *buf) 984{ 985 int error; 986 struct cyapa *cyapa = dev_get_drvdata(dev); 987 988 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 989 if (error) 990 return error; 991 error = sysfs_emit(buf, "%d.%d\n", 992 cyapa->fw_maj_ver, cyapa->fw_min_ver); 993 mutex_unlock(&cyapa->state_sync_lock); 994 return error; 995} 996 997static ssize_t cyapa_show_product_id(struct device *dev, 998 struct device_attribute *attr, char *buf) 999{ 1000 struct cyapa *cyapa = dev_get_drvdata(dev); 1001 int size; 1002 int error; 1003 1004 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 1005 if (error) 1006 return error; 1007 size = sysfs_emit(buf, "%s\n", cyapa->product_id); 1008 mutex_unlock(&cyapa->state_sync_lock); 1009 return size; 1010} 1011 1012static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name) 1013{ 1014 struct device *dev = &cyapa->client->dev; 1015 const struct firmware *fw; 1016 int error; 1017 1018 error = request_firmware(&fw, fw_name, dev); 1019 if (error) { 1020 dev_err(dev, "Could not load firmware from %s: %d\n", 1021 fw_name, error); 1022 return error; 1023 } 1024 1025 error = cyapa->ops->check_fw(cyapa, fw); 1026 if (error) { 1027 dev_err(dev, "Invalid CYAPA firmware image: %s\n", 1028 fw_name); 1029 goto done; 1030 } 1031 1032 /* 1033 * Resume the potentially suspended device because doing FW 1034 * update on a device not in the FULL mode has a chance to 1035 * fail. 1036 */ 1037 pm_runtime_get_sync(dev); 1038 1039 /* Require IRQ support for firmware update commands. */ 1040 cyapa_enable_irq_for_cmd(cyapa); 1041 1042 error = cyapa->ops->bl_enter(cyapa); 1043 if (error) { 1044 dev_err(dev, "bl_enter failed, %d\n", error); 1045 goto err_detect; 1046 } 1047 1048 error = cyapa->ops->bl_activate(cyapa); 1049 if (error) { 1050 dev_err(dev, "bl_activate failed, %d\n", error); 1051 goto err_detect; 1052 } 1053 1054 error = cyapa->ops->bl_initiate(cyapa, fw); 1055 if (error) { 1056 dev_err(dev, "bl_initiate failed, %d\n", error); 1057 goto err_detect; 1058 } 1059 1060 error = cyapa->ops->update_fw(cyapa, fw); 1061 if (error) { 1062 dev_err(dev, "update_fw failed, %d\n", error); 1063 goto err_detect; 1064 } 1065 1066err_detect: 1067 cyapa_disable_irq_for_cmd(cyapa); 1068 pm_runtime_put_noidle(dev); 1069 1070done: 1071 release_firmware(fw); 1072 return error; 1073} 1074 1075static ssize_t cyapa_update_fw_store(struct device *dev, 1076 struct device_attribute *attr, 1077 const char *buf, size_t count) 1078{ 1079 struct cyapa *cyapa = dev_get_drvdata(dev); 1080 char fw_name[NAME_MAX]; 1081 int ret, error; 1082 1083 if (count >= NAME_MAX) { 1084 dev_err(dev, "File name too long\n"); 1085 return -EINVAL; 1086 } 1087 1088 memcpy(fw_name, buf, count); 1089 if (fw_name[count - 1] == '\n') 1090 fw_name[count - 1] = '\0'; 1091 else 1092 fw_name[count] = '\0'; 1093 1094 if (cyapa->input) { 1095 /* 1096 * Force the input device to be registered after the firmware 1097 * image is updated, so if the corresponding parameters updated 1098 * in the new firmware image can taken effect immediately. 1099 */ 1100 input_unregister_device(cyapa->input); 1101 cyapa->input = NULL; 1102 } 1103 1104 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 1105 if (error) { 1106 /* 1107 * Whatever, do reinitialize to try to recover TP state to 1108 * previous state just as it entered fw update entrance. 1109 */ 1110 cyapa_reinitialize(cyapa); 1111 return error; 1112 } 1113 1114 error = cyapa_firmware(cyapa, fw_name); 1115 if (error) 1116 dev_err(dev, "firmware update failed: %d\n", error); 1117 else 1118 dev_dbg(dev, "firmware update successfully done.\n"); 1119 1120 /* 1121 * Re-detect trackpad device states because firmware update process 1122 * will reset trackpad device into bootloader mode. 1123 */ 1124 ret = cyapa_reinitialize(cyapa); 1125 if (ret) { 1126 dev_err(dev, "failed to re-detect after updated: %d\n", ret); 1127 error = error ? error : ret; 1128 } 1129 1130 mutex_unlock(&cyapa->state_sync_lock); 1131 1132 return error ? error : count; 1133} 1134 1135static ssize_t cyapa_calibrate_store(struct device *dev, 1136 struct device_attribute *attr, 1137 const char *buf, size_t count) 1138{ 1139 struct cyapa *cyapa = dev_get_drvdata(dev); 1140 int error; 1141 1142 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 1143 if (error) 1144 return error; 1145 1146 if (cyapa->operational) { 1147 cyapa_enable_irq_for_cmd(cyapa); 1148 error = cyapa->ops->calibrate_store(dev, attr, buf, count); 1149 cyapa_disable_irq_for_cmd(cyapa); 1150 } else { 1151 error = -EBUSY; /* Still running in bootloader mode. */ 1152 } 1153 1154 mutex_unlock(&cyapa->state_sync_lock); 1155 return error < 0 ? error : count; 1156} 1157 1158static ssize_t cyapa_show_baseline(struct device *dev, 1159 struct device_attribute *attr, char *buf) 1160{ 1161 struct cyapa *cyapa = dev_get_drvdata(dev); 1162 ssize_t error; 1163 1164 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 1165 if (error) 1166 return error; 1167 1168 if (cyapa->operational) { 1169 cyapa_enable_irq_for_cmd(cyapa); 1170 error = cyapa->ops->show_baseline(dev, attr, buf); 1171 cyapa_disable_irq_for_cmd(cyapa); 1172 } else { 1173 error = -EBUSY; /* Still running in bootloader mode. */ 1174 } 1175 1176 mutex_unlock(&cyapa->state_sync_lock); 1177 return error; 1178} 1179 1180static char *cyapa_state_to_string(struct cyapa *cyapa) 1181{ 1182 switch (cyapa->state) { 1183 case CYAPA_STATE_BL_BUSY: 1184 return "bootloader busy"; 1185 case CYAPA_STATE_BL_IDLE: 1186 return "bootloader idle"; 1187 case CYAPA_STATE_BL_ACTIVE: 1188 return "bootloader active"; 1189 case CYAPA_STATE_GEN5_BL: 1190 case CYAPA_STATE_GEN6_BL: 1191 return "bootloader"; 1192 case CYAPA_STATE_OP: 1193 case CYAPA_STATE_GEN5_APP: 1194 case CYAPA_STATE_GEN6_APP: 1195 return "operational"; /* Normal valid state. */ 1196 default: 1197 return "invalid mode"; 1198 } 1199} 1200 1201static ssize_t cyapa_show_mode(struct device *dev, 1202 struct device_attribute *attr, char *buf) 1203{ 1204 struct cyapa *cyapa = dev_get_drvdata(dev); 1205 int size; 1206 int error; 1207 1208 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 1209 if (error) 1210 return error; 1211 1212 size = sysfs_emit(buf, "gen%d %s\n", 1213 cyapa->gen, cyapa_state_to_string(cyapa)); 1214 1215 mutex_unlock(&cyapa->state_sync_lock); 1216 return size; 1217} 1218 1219static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL); 1220static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL); 1221static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store); 1222static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL); 1223static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store); 1224static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL); 1225 1226static struct attribute *cyapa_attrs[] = { 1227 &dev_attr_firmware_version.attr, 1228 &dev_attr_product_id.attr, 1229 &dev_attr_update_fw.attr, 1230 &dev_attr_baseline.attr, 1231 &dev_attr_calibrate.attr, 1232 &dev_attr_mode.attr, 1233 NULL, 1234}; 1235ATTRIBUTE_GROUPS(cyapa); 1236 1237static void cyapa_disable_regulator(void *data) 1238{ 1239 struct cyapa *cyapa = data; 1240 1241 regulator_disable(cyapa->vcc); 1242} 1243 1244static int cyapa_probe(struct i2c_client *client) 1245{ 1246 struct device *dev = &client->dev; 1247 struct cyapa *cyapa; 1248 u8 adapter_func; 1249 union i2c_smbus_data dummy; 1250 int error; 1251 1252 adapter_func = cyapa_check_adapter_functionality(client); 1253 if (adapter_func == CYAPA_ADAPTER_FUNC_NONE) { 1254 dev_err(dev, "not a supported I2C/SMBus adapter\n"); 1255 return -EIO; 1256 } 1257 1258 /* Make sure there is something at this address */ 1259 if (i2c_smbus_xfer(client->adapter, client->addr, 0, 1260 I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) 1261 return -ENODEV; 1262 1263 cyapa = devm_kzalloc(dev, sizeof(struct cyapa), GFP_KERNEL); 1264 if (!cyapa) 1265 return -ENOMEM; 1266 1267 /* i2c isn't supported, use smbus */ 1268 if (adapter_func == CYAPA_ADAPTER_FUNC_SMBUS) 1269 cyapa->smbus = true; 1270 1271 cyapa->client = client; 1272 i2c_set_clientdata(client, cyapa); 1273 sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr, 1274 client->addr); 1275 1276 cyapa->vcc = devm_regulator_get(dev, "vcc"); 1277 if (IS_ERR(cyapa->vcc)) { 1278 error = PTR_ERR(cyapa->vcc); 1279 dev_err(dev, "failed to get vcc regulator: %d\n", error); 1280 return error; 1281 } 1282 1283 error = regulator_enable(cyapa->vcc); 1284 if (error) { 1285 dev_err(dev, "failed to enable regulator: %d\n", error); 1286 return error; 1287 } 1288 1289 error = devm_add_action_or_reset(dev, cyapa_disable_regulator, cyapa); 1290 if (error) { 1291 dev_err(dev, "failed to add disable regulator action: %d\n", 1292 error); 1293 return error; 1294 } 1295 1296 error = cyapa_initialize(cyapa); 1297 if (error) { 1298 dev_err(dev, "failed to detect and initialize tp device.\n"); 1299 return error; 1300 } 1301 1302 error = cyapa_prepare_wakeup_controls(cyapa); 1303 if (error) { 1304 dev_err(dev, "failed to prepare wakeup controls: %d\n", error); 1305 return error; 1306 } 1307 1308 error = cyapa_start_runtime(cyapa); 1309 if (error) { 1310 dev_err(dev, "failed to start pm_runtime: %d\n", error); 1311 return error; 1312 } 1313 1314 error = devm_request_threaded_irq(dev, client->irq, 1315 NULL, cyapa_irq, 1316 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 1317 "cyapa", cyapa); 1318 if (error) { 1319 dev_err(dev, "failed to request threaded irq: %d\n", error); 1320 return error; 1321 } 1322 1323 /* Disable IRQ until the device is opened */ 1324 disable_irq(client->irq); 1325 1326 /* 1327 * Register the device in the input subsystem when it's operational. 1328 * Otherwise, keep in this driver, so it can be be recovered or updated 1329 * through the sysfs mode and update_fw interfaces by user or apps. 1330 */ 1331 if (cyapa->operational) { 1332 error = cyapa_create_input_dev(cyapa); 1333 if (error) { 1334 dev_err(dev, "create input_dev instance failed: %d\n", 1335 error); 1336 return error; 1337 } 1338 } 1339 1340 return 0; 1341} 1342 1343static int cyapa_suspend(struct device *dev) 1344{ 1345 struct i2c_client *client = to_i2c_client(dev); 1346 struct cyapa *cyapa = i2c_get_clientdata(client); 1347 u8 power_mode; 1348 int error; 1349 1350 error = mutex_lock_interruptible(&cyapa->state_sync_lock); 1351 if (error) 1352 return error; 1353 1354 /* 1355 * Runtime PM is enable only when device is in operational mode and 1356 * users in use, so need check it before disable it to 1357 * avoid unbalance warning. 1358 */ 1359 if (pm_runtime_enabled(dev)) 1360 pm_runtime_disable(dev); 1361 disable_irq(client->irq); 1362 1363 /* 1364 * Set trackpad device to idle mode if wakeup is allowed, 1365 * otherwise turn off. 1366 */ 1367 if (cyapa->operational) { 1368 power_mode = device_may_wakeup(dev) ? cyapa->suspend_power_mode 1369 : PWR_MODE_OFF; 1370 error = cyapa->ops->set_power_mode(cyapa, power_mode, 1371 cyapa->suspend_sleep_time, CYAPA_PM_SUSPEND); 1372 if (error) 1373 dev_err(dev, "suspend set power mode failed: %d\n", 1374 error); 1375 } 1376 1377 /* 1378 * Disable proximity interrupt when system idle, want true touch to 1379 * wake the system. 1380 */ 1381 if (cyapa->dev_pwr_mode != PWR_MODE_OFF) 1382 cyapa->ops->set_proximity(cyapa, false); 1383 1384 if (device_may_wakeup(dev)) 1385 cyapa->irq_wake = (enable_irq_wake(client->irq) == 0); 1386 1387 mutex_unlock(&cyapa->state_sync_lock); 1388 return 0; 1389} 1390 1391static int cyapa_resume(struct device *dev) 1392{ 1393 struct i2c_client *client = to_i2c_client(dev); 1394 struct cyapa *cyapa = i2c_get_clientdata(client); 1395 int error; 1396 1397 mutex_lock(&cyapa->state_sync_lock); 1398 1399 if (device_may_wakeup(dev) && cyapa->irq_wake) { 1400 disable_irq_wake(client->irq); 1401 cyapa->irq_wake = false; 1402 } 1403 1404 /* 1405 * Update device states and runtime PM states. 1406 * Re-Enable proximity interrupt after enter operational mode. 1407 */ 1408 error = cyapa_reinitialize(cyapa); 1409 if (error) 1410 dev_warn(dev, "failed to reinitialize TP device: %d\n", error); 1411 1412 enable_irq(client->irq); 1413 1414 mutex_unlock(&cyapa->state_sync_lock); 1415 return 0; 1416} 1417 1418static int cyapa_runtime_suspend(struct device *dev) 1419{ 1420 struct cyapa *cyapa = dev_get_drvdata(dev); 1421 int error; 1422 1423 error = cyapa->ops->set_power_mode(cyapa, 1424 cyapa->runtime_suspend_power_mode, 1425 cyapa->runtime_suspend_sleep_time, 1426 CYAPA_PM_RUNTIME_SUSPEND); 1427 if (error) 1428 dev_warn(dev, "runtime suspend failed: %d\n", error); 1429 1430 return 0; 1431} 1432 1433static int cyapa_runtime_resume(struct device *dev) 1434{ 1435 struct cyapa *cyapa = dev_get_drvdata(dev); 1436 int error; 1437 1438 error = cyapa->ops->set_power_mode(cyapa, 1439 PWR_MODE_FULL_ACTIVE, 0, CYAPA_PM_RUNTIME_RESUME); 1440 if (error) 1441 dev_warn(dev, "runtime resume failed: %d\n", error); 1442 1443 return 0; 1444} 1445 1446static const struct dev_pm_ops cyapa_pm_ops = { 1447 SYSTEM_SLEEP_PM_OPS(cyapa_suspend, cyapa_resume) 1448 RUNTIME_PM_OPS(cyapa_runtime_suspend, cyapa_runtime_resume, NULL) 1449}; 1450 1451static const struct i2c_device_id cyapa_id_table[] = { 1452 { "cyapa", 0 }, 1453 { }, 1454}; 1455MODULE_DEVICE_TABLE(i2c, cyapa_id_table); 1456 1457#ifdef CONFIG_ACPI 1458static const struct acpi_device_id cyapa_acpi_id[] = { 1459 { "CYAP0000", 0 }, /* Gen3 trackpad with 0x67 I2C address. */ 1460 { "CYAP0001", 0 }, /* Gen5 trackpad with 0x24 I2C address. */ 1461 { "CYAP0002", 0 }, /* Gen6 trackpad with 0x24 I2C address. */ 1462 { } 1463}; 1464MODULE_DEVICE_TABLE(acpi, cyapa_acpi_id); 1465#endif 1466 1467#ifdef CONFIG_OF 1468static const struct of_device_id cyapa_of_match[] = { 1469 { .compatible = "cypress,cyapa" }, 1470 { /* sentinel */ } 1471}; 1472MODULE_DEVICE_TABLE(of, cyapa_of_match); 1473#endif 1474 1475static struct i2c_driver cyapa_driver = { 1476 .driver = { 1477 .name = "cyapa", 1478 .dev_groups = cyapa_groups, 1479 .pm = pm_ptr(&cyapa_pm_ops), 1480 .acpi_match_table = ACPI_PTR(cyapa_acpi_id), 1481 .of_match_table = of_match_ptr(cyapa_of_match), 1482 }, 1483 1484 .probe = cyapa_probe, 1485 .id_table = cyapa_id_table, 1486}; 1487 1488module_i2c_driver(cyapa_driver); 1489 1490MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver"); 1491MODULE_AUTHOR("Dudley Du <dudl@cypress.com>"); 1492MODULE_LICENSE("GPL"); 1493